Impulse generator



Sept. 15, 1959 .1. F. DRESCHER 2,904,707

IMPULSE GENERATOR Filed Jan. 11, 1957 INVEN TOR. Joan F. DRESCHER BY flazia aafizga Arron/5X5 United States Patent if This invention relates generally to impulse generators which are employed to provide a relatively short-time pulse of electrical energy. The novel features of the present invention relate more particularly to an improved and simplified construction for effecting movement of the generator core as well as controlling this movement in a more precise manner than has been heretofore possible with present day conventional impulse generators.

Reference is made to applicants co-pending application entitled Impulse Generator, filed May 9, 1955 and assigned Serial Number 506,821, now Patent No. 2,784,327, for a general discussion of the principle of operation of implse generators as well as certain problems which are encountered.

The purpose of the present invention, as distinguished from the referenced co-pending application, is to provide a more simplified means of transmitting force to the core for urging movement of the core through the magnetic field and automatically effecting return of the core to its original position after the electrical impulse has been generated. Towards this end, the present invention relates to an improvement both as to the referred to application and applicants co-pending application entitled Impulse Generator, filed September 17, 1956, and assigned Serial Number 610,304; now Patent No. 2,832,902

, distant from its ends.

wherein a requirement of means for returning the core to its original position either in the form of a return spring or a return lever is eliminated. A further improvement has been eifected in providing a simple means of assuring symmetrical movement of the core throughout its path of travel in the magnetic field, whereby a maximum peak pulse is attained at a particular instant of time.

It is an object of the present invention, therefore, to provide an improved impulse generator of unusually simplified construction, which includes means for automatically returning the core to its original position after operation.

Another object of the present invention is to provide an improved impulse generator which will result in symmetrical movement of the core through the magnetic field during operation without the possibility of the creation of a secondary impulse peak.

A still further object of the present invention is to provide an impulse generator which may be inexpensively constructed with a minimum number of parts and yet which will give satisfactory maintenance-free service.

Generally, these and other objects of the present invention are attained by providing in an impulse generator a force transmitting member which has one portion secured to an end of the core. Spring means are employed, preferably a flat spring member, which has one portion either fixed to the impulse generator or fixed with respect to the impulse generator and another portion coupled to another part of the force transmitting member.

The spring means is so designed that a force is nor- Patented Sept. 15, 1959 ice mally exerted biasing the force transmitting member in a direction tending to retain a core in its normal or inoperative position. The spring means either integrally includes or is provided with an extension whereby the extension may be actuated as a handle to urge the force transmitting member in another direction forcing the core towards its operated position. However, as soon as pressure is released from the extension or other connection to the spring means, the spring means will act to return the core, in view of its coupling to the force transmitting member, back to its original position.

A further improvement of the present invention is to preferably include in the impulse generator construction a pivot pin or a similar member positioned so as to extend perpendicularly through the core at a point equi- With such a construction, any movement eifected at one end of the core results in an equal angular movement at the other end of the core.

A better understanding of the present invention will be had by reference to the attached drawings, illustrating a preferred embodiment, and in which:

Figure 1 is a cross section of the improved impulse generator before operation has been eifected;

Figure 2 is an end view of the impulse generator taken in the direction of the arrows 2-2 of Figure 1; and,

Figure 3 is a sectional view taken in the direction of the arrows 33 of Figure 1.

Referring now to the drawings, there is shown in Figure 1 an impulse generator according to the present invention provided with permanent magnets 10 at either end thereof disposed between a top side bar 11 and a bottom side bar 12. Projecting downwardly from an intermediate portion of the side bar 11 are poles 13 and 14; similarly, poles 15 and 16 extend upwardly from an intermediate portion of the bottom side bar 12.

A core 17 is positioned between the poles of the top side bar 11 and bottom side bar 12. The core 17 is positioned such that its end 17a is adapted to move between poles 13 and 15, and correspondingly, its end 17b is adapted to move between poles 14 and .16. In Figure 1, the core 17 is shown disposed in its unoperated or first position in which the end 17b is in contact with the pole 14 and the end 17a in contact with the pole 15.

Disposed around the core 17 in between the poles of the side bars 11 and 12 is a coil 18 having leads 19. The leads 19 have been schematically shown as passing through the top side bar 11 for suitable connection to the particular load to be operated by the impulse generator.

As an important feature of the present invention, a transverse bore 20 is shown as extending through the core 17 and the coil 18. The bore 20 is positioned at a point equidistant from the core ends 17a and 17b. Extending through the bore 20 is a pivot pin 21, more clearly shown in the view of Figure 3, which is journaled in the bore 20 so as to act as a point of pivoting of the core 17 as it is actuated either to its second, operated position or back to its normal, first position.

The top side bar 11 is provided with a slot 22 through which extends a force transmitting member 23. The force transmitting member 23 may be a rod of rigid construction, as shown, or may be provided with a given spring tension according to the particular design requirements of the impulse generator. The rod 23 has one end 24 firmly secured in the end 17b or the core 17. Its other end 25 is threaded, and secured thereon are coupling means in the form of nuts 26 and 27. In the usual construction, the nut 26 is fixed with respect to the rod 23 and the nut 27 may be adjustably positioned thereon according to the dimensional and operating requirements.

A spring means in the form of a flat spring 28 is shown having a free, upper portion 28a and a fixed lower portion 28b, the latter being secured with screws 29 to the bottom side bar 12. Referring now to Figure 2, .it may be seen that the spring 28 is provided with an aperture 3t) defining the limits of portions 28a and 28b and through which the rod 23 passes, whereby the rod523 is coupled to the spring means for a limited movement in view of the space nuts 26 and 27 secured thereon.

Referring now to Figure 3, it is seen that the pivot pin 21 may terminate in bearing surfaces 31, for example, adapted to be journaled in a casing or the like surrounding the impulse generator of Figure 1, the casing not being shown in the drawings. In an alternate construction, the bearing surfaces 31 might be extended to-have an arm or lever secured thereto such that movement of the core 17 could be effected directly by rotational movement of the pivot pin 21. In such a construction, the spring 28 andforce transmitting member 23 would not be required. With such a construction, it will be appreciated that the pivot pin 21 must be positioned through the core 17 with a tight fit such that the core 17 will rotate upon rotation of the pin 21. The pin 21 has been shown spaced from the bore 20 in the drawings since in the preferred construction of Figure 1 it is not necessary that the pivot pin 21 be positioned tightly in the bore 20.

The operation of the impulse generator will be apparent from the previous description. In Figure 1, the impulse generator is shown in its normal or first position. To eifect its operation, it is merly necessary for amanual or mechanical force to be imposed on the free end or upper portion 28a of the spring 28 overcoming its'biasing actionso that it strikes the nut 26 to in turn tend to rotate the core 17 about the pivot point established by the pin 21. An impulse will be generated in accordance with the principles heretofore disclosed in applicants referred to co-pending applications. .As a consequence of the employment of'the pivot pin 21, the angular movement of the core ends 17a and 17b will be exactly the same thereby limiting the possibility of creating a lagging or double impulse peak because of the core end 17a or the core end 1717 coming in contact with their respective pole pieces at different instances of time.

It is to benoted that the shape of the spring 28,.in conjunction with its particular structural relationship with the rod 23 and the impulse generator as a whole, enables it to act uniquely as in integral actuating spring and return spring. Thus, when a downwardforce is imposed on the uppenfree portion 28a, a tension will build up in this length (to the left of the rod. 23 in Figure 1), after the spring has contacted the lower nut 26, which will finally exert sufficient force to snap the 4 core 17 to its second, operated position. On the other hand, the portion 28b (to the right of the rod 23 in Figure 1) serves to effect the return of the core 17 to its normal, first position.

The improved impulse generator of the present application, therefore, results in a unit which may be more economically and simply constructed and yet which still permits automatic operation satisfactory for most applications. Although a preferred embodiment has been shown, it will be appreciated that certain modifications and changes maybe made Without departing from the spirit and scope of the-invention.

What is claimed is:

1. In an impulse'generator including a core movable from a first given position to a second given position: a force transmitting member having one portion thereof secured to an end of said core; spring means having one portion thereof fixed with respect to said;impulse generator; coupling means retaining another portion of said spring means to another portion of said force transmitting member, .said another portion of said spring means actingto .bias said force transmitting member in a directionurging said .core towards said first given position; and, said spring means including an extension thereof adaptable as a handle for actuating said force transmitting member in another direction to urge said .core towards saidrsecond given position.

2. An apparatus according to claim 1, inwhich said springlmeans comprises a flat spring, and in which said one portion of-said spring means is. secured to said ;impulse generator.

3. An apparatus according to claim 2, in whichsaid forcev transmitting member comprises a rod, and in whichone .end of .said rod is rigidlysecured tovan end of said core.

4. .An apparatus according to claim v3, in which said another portion of said spring is provided with an apertureofgiven area through which-said rod may extend, and means provided on said rod for limiting movement of said spring in an axial direction with respect to said rod.

5. An apparatus according to claim .4, in which said means on said rod comprise two spaced nuts, atleast one of said nuts being adjustably positioned thereon.

References Cited in. the file of thispatent UNITED STATES PATENTS 1,635,935 Godefroy .July 12, 1927 1,985,357 Wallace Dec. 25, 1934 2,135,843 Pye Nov. 8, 1938 2,376,557 Severance May 22, 1945 2,687,481 Petersen Aug..24, 1954 

